package servlets.admin.config;

import dbProcs.Setter;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.owasp.encoder.Encode;
import utils.ShepherdLogManager;
import utils.Validate;

/**
 * This class is responsible for requests to configure the applications core database sign on
 * information. <br>
 * <br>
 * This file is part of the Security Shepherd Project.
 *
 * <p>The Security Shepherd project is free software: you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software Foundation, either
 * version 3 of the License, or (at your option) any later version.<br>
 *
 * <p>The Security Shepherd project is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
 * PURPOSE. See the GNU General Public License for more details.<br>
 *
 * <p>You should have received a copy of the GNU General Public License along with the Security
 * Shepherd project. If not, see <http://www.gnu.org/licenses/>.
 *
 * @author Mark Denihan
 */
public class ChangeCoreDatabase extends HttpServlet {

  private static final long serialVersionUID = 1L;
  private static final Logger log = LogManager.getLogger(ChangeCoreDatabase.class);

  /**
   * If this method is called by a valid administrator the site.properties file that contains the
   * database information required to make a connection is updated
   *
   * @param csrfToken
   */
  public void doPost(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException {
    // Setting IpAddress To Log and taking header for original IP if forwarded from proxy
    ShepherdLogManager.setRequestIp(request.getRemoteAddr(), request.getHeader("X-Forwarded-For"));
    log.debug("*** servlets.Admin.config.ChangeCoreDatabase ***");
    PrintWriter out = response.getWriter();
    out.print(getServletInfo());
    HttpSession ses = request.getSession(true);
    Cookie tokenCookie = Validate.getToken(request.getCookies());
    Object tokenParmeter = request.getParameter("csrfToken");
    if (Validate.validateAdminSession(ses, tokenCookie, tokenParmeter)) {
      ShepherdLogManager.setRequestIp(
          request.getRemoteAddr(),
          request.getHeader("X-Forwarded-For"),
          ses.getAttribute("userName").toString());
      log.debug("Current User: " + ses.getAttribute("userName").toString());
      if (Validate.validateTokens(tokenCookie, tokenParmeter)) {
        try {
          log.debug("Getting ApplicationRoot");
          String ApplicationRoot = getServletContext().getRealPath("");
          log.debug("Servlet root = " + ApplicationRoot);

          log.debug("Getting Parameters");
          String url = Validate.validateParameter(request.getParameter("databaseUrl"), 256);
          log.debug("URL = " + url);
          String userName =
              Validate.validateParameter(request.getParameter("databaseUsername"), 256);
          log.debug("userName = " + userName);
          String password =
              Validate.validateParameter(request.getParameter("databasePassword"), 256);
          log.debug("password = NOTSHOWN");

          boolean validData = !url.isEmpty() && !userName.isEmpty() && !password.isEmpty();
          if (Setter.setCoreDatabaseInfo(ApplicationRoot, url, userName, password)) {
            out.write(
                "<h3 class='title'>Core Database Info Updated</h3>"
                    + "<p>The Core Database properties have successfully been updated!</p>");
          } else {
            // Validation Error Responses
            String errorMessage = "An Error Occurred ";
            if (!validData) {
              log.error("Invalid Application Address");
              errorMessage += "Invalid Host Address. Please try again";
            } else {
              log.error("Unexpected Failure");
              errorMessage = "An Error Occurred";
            }
            out.print(
                "<h3 class=\"title\">Core Database Info Update Failure</h3><br>"
                    + "<p><font color=\"red\">"
                    + Encode.forHtml(errorMessage)
                    + "</font><p>");
          }
        } catch (Exception e) {
          log.error("Core Database Info Update Error: " + e.toString());
          out.print(
              "<h3 class=\"title\">Core Database Info Update Failure</h3><br>"
                  + "<p>"
                  + "<font color=\"red\">An error Occurred! Please try again.</font>"
                  + "<p>");
        }
      } else {
        log.debug("CSRF tokens did not match");
        out.print(
            "<h3 class=\"title\">Core Database Info Update Failure</h3><br>"
                + "<p>"
                + "<font color=\"red\">An error Occurred! CSRF Tokens did not match.</font>"
                + "<p>");
      }
    } else {
      out.print(
          "<h3 class=\"title\">Core Database Info Update Failure</h3><br><p><font color=\"red\">An"
              + " error Occurred! Please log in or try non administrator functions!</font><p>");
    }
    log.debug("*** servlets.Admin.config.ChangeCoreDatabase END ***");
  }
}
